Gynecomastia is a fairly common, but rarely talked about,
condition of enlarged male breasts. Sometimes overdeveloped male breasts
can be linked to specific drugs or medical problems. Most commonly gynecomastia
is caused by excess glandular tissue (localized fat deposits). Male
breast reduction surgery can help men feel better about
their appearance by creating a more masculine chest contour.

Gynecomastia comes from the Greek words gyne and mastos,
meaning female and breasts, roughly translating to female-like breasts.
Gynecomastia is a benign condition that accounts for 60% of all disorders
of the male breast and 85% of male breast masses. It can occur in persons
of any age, but 40% of cases occur in adolescent boys aged 14-15.5 years.
As many as 65% of teenage boys have gynecomastia. In 90% of those teenage
boys, gynecomastia goes away on its own in 2 to 3 years. Approximately
40% of healthy men and up to 70% of hospitalized men have palpable breast
tissue. The prevalence rate increases to more than 60% in those in their
seventies.

Some men and boys have fat on their chests that makes it
look like they have breasts. This condition is called pseudogynecomastia
(false gynecomastia). It's not the same thing as gynecomastia, they may
just be overweight.